Only the Korean F3 has a FM chipset. European devices don't have the FM chipset.
That's why the FM menu has been removed in EU region code. If you change to KR region code you'll see the FM menu but it won't work since it's missing hardware.

The main reason is costs. Without the FM tuner Samsung can sell the F3 cheaper in Europe.
If you want a similar device with FM radio, I suggest you to buy a U6 instead